Rock stars before they were famous

From Mick Jagger and Kurt Cobain to Madonna and Lady Gaga, we’ve unearthed photos of some of world’s biggest pop stars before they became famous. See if you can guess who they are before reading the captions below each picture. Leave a comment below or join the conversation on Twitter: @MusicSF

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Katy Perry: Then known as Christian rocker Katy Hudson, covering up her most valuable assets. (We're talking about her lungs, of course.) (Columbia Records)

Katy Perry: Then known as Christian rocker Katy Hudson, covering up her most valuable assets. (We're talking about her lungs, of course.) (Columbia Records)

The Beatles: George Harrison, 14, John Lennon, 16, and Paul McCartney, 15, in 1957 when they were known as the Quarrymen. The only thing standing between them and world domination was a drummer with well-defined nostrils. (Apple Records) less

The Beatles: George Harrison, 14, John Lennon, 16, and Paul McCartney, 15, in 1957 when they were known as the Quarrymen. The only thing standing between them and world domination was a drummer with ... more